The Telemecanique GB2 thermal-magnetic circuit breaker range from
Schneider Electric provides more effective and convenient protection for
control circuits than more commonly used HRC fuses. Available in
single-pole-plus-neutral and two-pole versions, the GB2 is designed to
avoid nuisance tripping on current peaks while fully protecting against
short-circuit and overload conditions.
The compact DIN-rail mounting devices are supplied in three variants: the
GB2-CB with 12 ratings up to 20A for single-pole operation; the GB2-CD
with solid neutral, which is suitable for protecting single-phase control
transformer secondary windings, and the GB2-DB two-pole circuit breaker,
which will protect the primary windings of control circuit transformers
rated to 5kVA.